83 lines
2.5 KiB
Bash
83 lines
2.5 KiB
Bash
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# SPDX-License-Identifier: GPL-2.0-only
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# Logic based on util/chromeos/crosfirmware.sh in coreboot cfc26ce278.
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# Modifications in this version are Copyright 2021 and 2023 Leah Rowe.
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# Original copyright detailed in repo: https://review.coreboot.org/coreboot/
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extract_mrc()
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{
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[ -z "${MRC_board}" ] && err "extract_mrc $MRC_hash: MRC_board not set"
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[ -z "${CONFIG_MRC_FILE}" ] && \
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err "extract_mrc $MRC_hash: CONFIG_MRC_FILE not set"
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_file="${MRC_url##*/}"
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_file="${_file%.zip}"
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_mrc_destination="${CONFIG_MRC_FILE#../../}"
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mkdirs "${_mrc_destination}" "extract_mrc" || return 0
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(
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cd "${appdir}" || err "extract_mrc: !cd ${appdir}"
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extract_partition ROOT-A "${_file}" root-a.ext2
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extract_shellball root-a.ext2 chromeos-firmwareupdate-${MRC_board}
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extract_coreboot chromeos-firmwareupdate-${MRC_board}
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)
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"${cbfstool}" "${appdir}/"coreboot-*.bin extract -n mrc.bin \
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-f "${_mrc_destination}" -r RO_SECTION || \
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err "extract_mrc: could not fetch mrc.bin"
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}
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extract_partition()
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{
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NAME=${1}
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FILE=${2}
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ROOTFS=${3}
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_bs=1024
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printf "Extracting ROOT-A partition\n"
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ROOTP=$( printf "unit\nB\nprint\nquit\n" | \
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parted "${FILE}" 2>/dev/null | grep "${NAME}" )
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START=$(( $( echo ${ROOTP} | cut -f2 -d\ | tr -d "B" ) ))
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SIZE=$(( $( echo ${ROOTP} | cut -f4 -d\ | tr -d "B" ) ))
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dd if="${FILE}" of="${ROOTFS}" bs=${_bs} skip=$(( ${START} / ${_bs} )) \
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count=$(( ${SIZE} / ${_bs} )) || \
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err "extract_partition: can't extract root file system"
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}
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extract_shellball()
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{
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ROOTFS=${1}
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SHELLBALL=${2}
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printf "Extracting chromeos-firmwareupdate\n"
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printf "cd /usr/sbin\ndump chromeos-firmwareupdate ${SHELLBALL}\nquit" \
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| debugfs "${ROOTFS}" || err "extract_shellball: debugfs"
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}
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extract_coreboot()
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{
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_shellball=${1}
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_unpacked=$( mktemp -d )
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printf "Extracting coreboot image\n"
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[ -f "${_shellball}" ] || \
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err "extract_coreboot: shellball missing in google cros image"
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sh "${_shellball}" --unpack "${_unpacked}" || \
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err "extract_coreboot: shellball exits with non-zero status"
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# TODO: audit the f* out of that shellball, for each mrc version.
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# it has to be updated for each mrc update. we should ideally
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# implement the functionality ourselves.
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[ -f "${_unpacked}/VERSION" ] || \
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err "extract_coreboot: VERSION file missing on google coreboot rom"
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_version=$( cat "${_unpacked}/VERSION" | grep BIOS\ version: | \
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cut -f2 -d: | tr -d \ )
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cp "${_unpacked}/bios.bin" "coreboot-${_version}.bin" || \
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err "extract_coreboot: cannot copy google cros rom"
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}
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